docs(memory): add MemoryVision.md + gap analysis and related doc updates

- New MemoryVision.md outlining long-term vision for phase-memory integration in cya (profiles, phases, lifecycle, ports)
- Persisted full Intent-vs-Scope gap analysis in history/
- Updated SCOPE.md to reflect post-MVP reality and MemoryVision direction
- Minor cross-references in AGENTS.md and the CYA-WP-0001 workplan

This lays the foundation for the next workplan (CYA-WP-0002) focused on realizing the MemoryVision.

Refs: MemoryVision.md, history/2026-05-26-CYA-Intent-Scope-Gap-Analysis.md, CYA-WP-0001 T05/T08

AGENTS.md

@@ -166,20 +166,28 @@ First useful worker moves:
 
 ## Commands
 
-The repo is currently an intent/document seed. There is no build or test
-system yet.
-
-Useful inspection commands:
-
 ```bash
-rg --files
-sed -n '1,240p' INTENT.md
+# Install (editable, for development)
+pip install -e .
+
+# Run the assistant
+cya "your natural language request here"
+cya --help
+cya --explain-context "show me what context would be collected"
+
+# Tests (safety-focused, no LLM required)
+python -m pytest tests/ -q
+# or: pytest tests/ -q
+
+# Git / inspection (always useful)
 git status --short
 git log --oneline -5
+rg --files
 ```
 
-When implementation starts, update this section with the package manager,
-build, test, lint, and local run commands.
+No formal lint or build system yet (ruff is configured in pyproject.toml but not enforced in CI for the first slice). Add `make test` / `make lint` targets in a follow-on when needed.
+
+Current primary entry point: `cya` (after editable install).
 
 ## Workplan Convention